Having recently started a blog that I am making into an authority site, I debate each and every spam comment I get. Sometimes I find myself looking at a comment that I know is purely for a pr3/pr4 backlink from my blog, yet I have zero legit comments on any of my posts... So when I see a well thought out response despite the fact that I know its backlink spam, I actually keep some of them for what I call "onsite authority." What does BHW feel about this? Is it not worth it and possibly devaluing my site's PR? Or does it not affect me and these guys are just lucky guys enjoying this symbiotic relationship? Should I just fake my own comments and link back to my web 2.0's instead (post with proxies)?